Safety device for incandescent-gas-light burners.



G. D LEN. v SAFETY DEVICE FOR INOANDESCENT GAS LIGHT BURNERS.

APPLICATION FILED OCT. 26, 1911.

Patented Mar. 16, 1915 \NIT/VESES Y i mniuTfh i GUSTAF DALEN, GE STOCKHGLIE, SVIEDEII.

Application filed Gctober 26, 1911.

T 0 all ill/ 102M it may concern Be it known that l, Gusrav DALiiN, a subject of Sweden, residing at Stockholm, Sweden, have invented new and useful Improvements in Safety Devices for Incandescent- Gas-Light Burners, of which the following is a specification.

The present inv ntion refers to a safety device, to be used in connection with lighting plants, in which incandescent light burners are supplied with a mixture of gas and air under ressure, said mixture being established in a municating with the burners.

The invention has for its object to avoid expl sion of the mixture of gas and air in the conduit, caused by accidental flowing back of the flame from the burner to the gas mixture conduit, and consists in a safety device placed for this purpose in front of the incandescent gas burner.

The invention moreover has for its object to prevent explosion of the mixture of gas and air in the mixing apparatus in the event, that the above mentioned safety device should not work, and consists for this purpose in a safety device, placed after the mixing apparatus, in the direction of the flow of gas and air mixture to be reckoned.

()n the drawing a mixing apparatus is shown in elevation in connection with a conduit between the same and an incandescent gas burner, said conduit and gas burner being provided with safety devices according to the invention. The drawing shows said latter parts in longitudinal section.

1 indicates a mixing apparatus of any suitable construction for mixing combustible gas and air in desired proportions.

2 is the gas supply pipe and 3 the air supply pipe of the mixing apparatus. Inthe conduit between said latter and the burner 8 a safety apparatus is inserted, which in the constructional form shown consists of a casing 4, provided with a partition wall 5, reaching almost to the bottom as in fluid seal devices. The casing l is partly filled with an easily fusible, finely divided metal 6 such as lead. The metal layer allows the necessary gas-air mixture to pass, the spaces between. the metal pieces being so small as to prevent a flame burning in the conduit 7 to be transmitted through the casing 4:. However if the gas in the casing should be ignited, the metal 6 will fuse and form a Specification of Letters Eatent.

mixing apparatus, com-- Patented Mar. 16, 19315.

Serial No. #556,854.

fluid seal, shutting oil the mixing apparatus from the conduit 7.

The second safet device, which is insert d in front of the incandescent gas light burr r in the constructional form shown of a screw bolt 10, screwed into the pipe section 9 of toe gas conduit 7, and nearly filling up the gas channel 11 of the pipe section, only leaving a narrow annular opening for the passage of the gas. The conical end of the screw bolt 10 regulates the q antity of gas ii wing to the burner 8 and thereby the size of the flame. if said me should flow back in the channel of the burner, it can hardly be transmitted through the said narrow opening.

What I claim is 1. [a device of the character described comprising a trap structure having an inlet and an utlet, and a mass of fusible metal particles located in said trap in the path of the gas flowing therethrough, said mass per mitting the free flow of gas through the trap, and adapted to fuse and form a seal under the influence of heat or flame.

2. A. device of the character described comprising a trap structure having an inlet and an outlet, and a mass of fusible particles located in said trap in the path of the gas flowing therethrough, said mass permitting free flow of gas through the trap, and adapted to fuse and form a seal under the influence of heat or flame.

3. A device of the character described comprising a trap structure having an inlet and an outlet, and a mass of fusible parti cles located in said trap in the path of the gas flowing therethrough, said mass permitting free flow of gas through the trap, and adapted to fuse and form a seal under the influence of heat or flame, said trap being provided with removable bottom whereby the fused mass may be removed.

4. A device of the character described comprising a casing having an inlet and an outlet, a partition within said casing between said inlet and outlet and extending downwardly from the top thereof, the lower edge of said partition being spaced from the bottom of the casing to form a passage, and a mass of fusible particles positioned within said casing and filling said passage whereby the gas must pass through said mass.

5. A device of the character described con sts MM, I41.)

comprising a casing having an inlet and an outlet, a partition within said casing between said inlet and outlet and extending downwardly from the top thereof, the lower edge of said partition being spaced from the bottom of the casing'to form a passage, and a mass of fusible particles positioned within said casing and filling said passage whereby the gas must pass through said mass, said casing being provided with a removable bottom whereby the fused mass may be removed. 7

r 6. A device of the character described, comprising a trap structure having an inlet and an outlet with a communicating passage therebetween, and a mass of segregatedparticles of fusible material located in said communicating passage, said particles normaliy permitting free flow of gas through the trap, but adapted to fuse under the influence of heat and close said passage.

1. comprising an'apparatus for mixing gas and air, anincandescent burner, 'a conduit connecting the mixing apparatus with the burnerfor conducting the mixture under pressure to the latter, means arranged within the conduit adjacent to the burner'for restricting the size of the passageway to Gopies of this patent may he obtained for five cents each, by addressingthe Commissioner of Patents.

A device of the character described,

resist back flow of the flame, and a therm0- static device provided within the conduit two means provided within the conduit in succession for preventing a back flow of flame from the burner to the mixin a aratus, one of the said means comprising 'a restricted passage arranged 1nproximity to the burner, and the other means being arran ed adjacent to the mixing apparatus and containing a fusible mass adapted to fuse under the influence of-the flame to seal the conduit at this part. a in testimony whereof I have signed my name tothis specification in the presence of two subscribingwitnesses.

, GUSTAF DALEN. Witnesses: V

H. C. Coxn, Trio. Lnsnn'ronx.

Washington, D. 0. 1 V 

